Robert Bosch Gmbh, headquartered in Gerlingen, Germany, produces the Bosch brand of appliances, which includes high-end dishwashers. These dishwashers feature speciality options like hidden controls and custom panels, and Bosch sells these dishwashers worldwide. A common issue with these dishwashers is that they can be noisy. Locate and repair the source of the noise to avoid expensive service fees.
A Bosch dishwasher beeps at the end of the cycle. This is part of the normal operation. You can turn off this end-of-cycle beep. Water movement noises like whooshing sounds are also normal. These noises are caused by water entering or exiting the tub, or by the spray arm moving water around the tub. You may also hear grinding noises as your dishwasher grinds up food particles.
If you hear a rattling inside the dishwasher, open up the door, and rearrange the dishes. The noise is caused by dishes hitting against each other, which can cause chipping or cracking. If you hear a thumping noise, an object is blocking the spray arm. Move this object out of the spray arm's path. A vibrating noise indicates that your Bosch dishwasher is not level. Adjust the levelling legs until the dishwasher is level. Use a carpenter's level to assist you with this process. If the floor is uneven or unstable, fix the flooring. Or, place wood shims or a 3/4 inch piece of plywood under the dishwasher.
Pump/Water Inlet Valve
If you hear a rattling or consistent grinding sound inside the dishwasher, check the pump, which is located under the spray arm and bottom rack. This part can get clogged with food particles and debris. Stop the dishwasher, and clean out the dishwasher pump with a toothpick. If you hear a thumping or buzzing sound at the back of the dishwasher, check the water inlet valve. As this component wears out, it gets noisy. You must replace the whole assembly since this component is difficult to repair.
The motor has a plastic disc connected to it, which can break off if it wears out. You must replace the whole motor since this component is difficult to fix. Check the motor bearings, which can make noise if they get wet. If the bearings are wet, your tub seal is compromised. Pry it out with a crowbar, and install a new one. A squealing noise usually indicates that the heater fan is warped or rusted. Order a new one since you can't usually repair this part.